rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1):
 P16934/1:b..l

rcu: 	(detected by 1, t=10502 jiffies, g=114141, q=496 ncpus=2)
task:syz.2.2859      state:R
  running task     stack:24256 pid:16934 tgid:16917 ppid:5842   task_flags:0x400040 flags:0x08080001
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5298 [inline]
 __schedule+0x15dd/0x52d0 kernel/sched/core.c:6911
 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7238
 irqentry_exit+0x599/0x620 kernel/entry/common.c:239
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:unwind_next_frame+0xcb0/0x23c0 arch/x86/kernel/unwind_orc.c:596
Code: 44 24 40 0f b6 04 28 84 c0 0f 85 68 11 00 00 49 89 df 49 c1 ef 03 41 0f b6 04 2f 84 c0 0f 85 78 11 00 00 0f b6 76 01 83 e6 07 <83> fe 04 0f 84 4e 04 00 00 83 fe 03 0f 84 f5 01 00 00 83 fe 02 0f
RSP: 0000:ffffc9000cf8f258 EFLAGS: 00000206

RAX: 0000000000000000 RBX: ffffffff909d1a21 RCX: ffffffff9023f9b4
RDX: ffffffff909d1a1c RSI: 0000000000000003 RDI: ffffffff8c27c1a0
RBP: dffffc0000000000 R08: 0000000000000007 R09: ffffffff8e75e520
R10: ffffc9000cf8f378 R11: ffffffff81b0c240 R12: ffffc9000cf8ff48
R13: ffffc9000cf8f378 R14: ffffc9000cf8f328 R15: 1ffffffff213a344
 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57
 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556
 task_work_add+0xb6/0x440 kernel/task_work.c:70
 __fput_deferred+0x143/0x380 fs/file_table.c:530
 do_accept+0x41d/0x760 net/socket.c:2007
 io_accept+0x310/0x7a0 io_uring/net.c:1669
 __io_issue_sqe+0x180/0x4b0 io_uring/io_uring.c:1384
 io_issue_sqe+0x164/0xf90 io_uring/io_uring.c:1407
 io_queue_sqe io_uring/io_uring.c:1634 [inline]
 io_submit_sqe io_uring/io_uring.c:1920 [inline]
 io_submit_sqes+0xcb1/0x2400 io_uring/io_uring.c:2043
 __do_sys_io_uring_enter io_uring/io_uring.c:2604 [inline]
 __se_sys_io_uring_enter+0x2cc/0x18c0 io_uring/io_uring.c:2539
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0x20d/0x640 arch/x86/entry/syscall_32.c:307
 do_fast_syscall_32+0x33/0x70 arch/x86/entry/syscall_32.c:332
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7ff7f6c
RSP: 002b:00000000f549550c EFLAGS: 00000206
 ORIG_RAX: 00000000000001aa
RAX: ffffffffffffffda RBX: 000000000000000c RCX: 0000000000001bfd
RDX: 0000000000003e44 RSI: 0000000000000008 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread starved for 9499 jiffies! g114141 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task    
 stack:27648 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5298 [inline]
 __schedule+0x15dd/0x52d0 kernel/sched/core.c:6911
 __schedule_loop kernel/sched/core.c:6993 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:7008
 schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095
 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:63
Code: ae 6c 02 c3 cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d e3 12 1b 00 fb f4 <e9> fc e9 02 00 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffc90000197e20 EFLAGS: 00000246

RAX: 0000000001839c39 RBX: ffffffff819a8e5a RCX: 0000000080000001
RDX: 0000000000000001 RSI: ffffffff8def7104 RDI: ffffffff8c27c200
RBP: ffffc90000197f10 R08: ffff8880b873395b R09: 1ffff110170e672b
R10: dffffc0000000000 R11: ffffed10170e672c R12: ffffffff90119cb0
R13: 0000000000000001 R14: 0000000000000001 R15: 1ffff11003b50000
FS:  0000000000000000(0000) GS:ffff888125560000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000f50b2956 CR3: 000000007dcb0000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 000000000000000e DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 arch_safe_halt arch/x86/kernel/process.c:766 [inline]
 default_idle+0x9/0x20 arch/x86/kernel/process.c:767
 default_idle_call+0x72/0xb0 kernel/sched/idle.c:122
 cpuidle_idle_call kernel/sched/idle.c:191 [inline]
 do_idle+0x1ba/0x5d0 kernel/sched/idle.c:341
 cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:439
 start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:312
 common_startup_64+0x13e/0x147
 </TASK>